Video game "Super Dune II Classic" v1.5g, the most known fan mod of the real time strategy game "Dune II" / "Dune 2"
for MS-DOS. It's an improved version of "Super Dune 2: The Destruction" released in 1994; the original is also archived here.
The three campaigns/houses of Dune 2 are replaced with Mercenary (yellow), Sardaukar (purple) and Fremen (orange). The original houses still appear sometimes as enemies. The new campaigns are more difficult than the original and meant for experienced players. Each new house has different characteristics, notably the Fremen can control the sandworms.
"Super Dune 2" can also be played with better interface in the remakes "Dune Dynasty"
and "Dune Legacy"